An NPN transistor is the most common type of bipolar junction transistor, or REASONABLE BJT for short. BJTs are often referred to simply as transistors, and come in two main types: NPN and PNP. "N" represents a negative grade of material and "P" represents a positive power class. NPN transistors have a positive classroom is located in between two negative class. Transistors are commonly used in the circuits for amplifying or switching electrical signals that travel through them.NPN transistor can be used in two different modes: forward biased mode and reverse bias mode. In forward-biased, the electric current can easily flow through it. Thus, it acts like a closed switch. However, in reversed bias mode, the line that is not realistic and therefore, it acts as a switch to open.
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